Class: Wardite::WasiSnapshotPreview1

Inherits:
Object
  • Object
show all
Includes:
ValueHelper, WasmModule
Defined in:
lib/wardite/wasi.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from WasmModule

#callable, #invoke

Methods included from ValueHelper

#F32, #F64, #I32, #I64

Constructor Details

#initialize(argv: [], mapdir: {}) ⇒ WasiSnapshotPreview1 



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# File 'lib/wardite/wasi.rb', line 24

def initialize(argv: [], mapdir: {})
  @fd_table = {
    0 => STDIN,
    1 => STDOUT,
    2 => STDERR,
  }
  @fd_count = 3
  @argv = argv
  @mapdir = mapdir

  @dirent_cache = {}
end

Instance Attribute Details

#argv ⇒ Object

: Array



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# File 'lib/wardite/wasi.rb', line 17

def argv
  @argv
end

#dirent_cache ⇒ Object

: Hash[Integer, ::Wardite::Wasi::DirentCache]



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# File 'lib/wardite/wasi.rb', line 19

def dirent_cache
  @dirent_cache
end

#fd_count ⇒ Object

: Integer



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# File 'lib/wardite/wasi.rb', line 16

def fd_count
  @fd_count
end

#fd_table ⇒ Object

: Hash[Integer, (IO|File|::Wardite::Wasi::PreopenedDir)]



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# File 'lib/wardite/wasi.rb', line 15

def fd_table
  @fd_table
end

#mapdir ⇒ Object

: Hash[String, String]



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# File 'lib/wardite/wasi.rb', line 18

def mapdir
  @mapdir
end

Instance Method Details

#args_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 150

def args_get(store, args)
  arg_offsets_p = args[0].value
  arg_data_buf_p = args[1].value
  if !arg_data_buf_p.is_a?(Integer)
    raise ArgumentError, "invalid type of args: #{args.inspect}"
  end

  arg_offsets = [] #: Array[Integer]
  arg_data_slice = [] #: Array[String]
  current_offset = arg_data_buf_p
  @argv.each do |arg|
    arg_offsets << current_offset
    arg_data_slice << arg
    current_offset += arg.size + 1
  end
  arg_data = arg_data_slice.join("\0") + "\0"

  memory = store.memories[0]
  memory.data[arg_data_buf_p...(arg_data_buf_p + arg_data.size)] = arg_data

  arg_offsets.each_with_index do |offset, i|
    data_begin = arg_offsets_p + i * 4
    memory.data[data_begin...(data_begin + 4)] = [offset].pack("I!")
  end

  0
end

#args_sizes_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 181

def args_sizes_get(store, args)
  argc_p = args[0].value
  arglen_p = args[1].value
  argc = @argv.length
  arglen = @argv.map{|arg| arg.size + 1}.sum

  memory = store.memories[0]
  memory.data[argc_p...(argc_p+4)] = [argc].pack("I!")
  memory.data[arglen_p...(arglen_p+4)] = [arglen].pack("I!")
  0
end

#clock_time_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 242

def clock_time_get(store, args)
  clock_id = args[0].value
  # we dont use precision...
  _precision = args[1].value
  timebuf64 = args[2].value
  if clock_id != 0 # - CLOCKID_REALTIME
    # raise NotImplementedError, "CLOCKID_REALTIME is an only supported id"
    return Wasi::EINVAL
  end
  # timestamp in nanoseconds
  now = Time.now.to_i * 1_000_000

  memory = store.memories[0]
  now_packed = [now].pack("Q!")
  memory.data[timebuf64...(timebuf64+8)] = now_packed
  0
end

#environ_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 211

def environ_get(store, args)
  environ_offsets_p = args[0].value
  environ_data_buf_p = args[1].value
  if !environ_data_buf_p.is_a?(Integer)
    raise ArgumentError, "invalid type of args: #{args.inspect}"
  end

  environ_offsets = [] #: Array[Integer]
  environ_data_slice = [] #: Array[String]
  current_offset = environ_data_buf_p
  ENV.each do |k, v|
    environ_offsets << current_offset
    environ_data_slice << "#{k}=#{v}"
    current_offset += "#{k}=#{v}".size + 1
  end
  environ_data = environ_data_slice.join("\0") + "\0"

  memory = store.memories[0]
  memory.data[environ_data_buf_p...(environ_data_buf_p + environ_data.size)] = environ_data

  environ_offsets.each_with_index do |offset, i|
    data_begin = environ_offsets_p + i * 4
    memory.data[data_begin...(data_begin + 4)] = [offset].pack("I!")
  end

  0
end

#environ_sizes_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 196

def environ_sizes_get(store, args)
  envc_p = args[0].value
  envlen_p = args[1].value
  envc = ENV.length
  envlen = ENV.map{|k,v| k.size + v.size + 1}.sum

  memory = store.memories[0]
  memory.data[envc_p...(envc_p+4)] = [envc].pack("I!")
  memory.data[envlen_p...(envlen_p+4)] = [envlen].pack("I!")
  0
end

#fd_close(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 714

def fd_close(store, args)
  fd = args[0].value.to_i
  if fd >= fd_count
    return Wasi::EBADF
  end
  file = @fd_table[fd]
  if !file
    return Wasi::EBADF
  end
  if file.is_a?(Wasi::PreopenedDir)
    # do nothing for preopened dir...?
    $stderr.puts "close preopened dir?: #{file.guest_path}"
    @fd_table.delete(fd)
    return 0
  end
  file.close
  @fd_table.delete(fd)
  0
rescue Errno::EBADF
  return Wasi::EBADF      
end

#fd_fdstat_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 578

def fd_fdstat_get(store, args)
  fd = args[0].value.to_i
  fdstat_offset = args[1].value.to_i
  if fd >= fd_count
    return Wasi::EBADF
  end
  file = @fd_table[fd]
  fdflags = 0
  if !file
    return Wasi::EBADF
  elsif file.is_a?(Wasi::PreopenedDir)
    file = File.open(file.guest_path) # reopen directory
  elsif file.is_a?(IO) && !file.is_a?(File)
    fdflags |= Wasi::FD_APPEND
  else
    if (Fcntl::O_APPEND & file.fcntl(Fcntl::F_GETFL, 0)) != 0
      fdflags |= Wasi::FD_APPEND
    end
  end

  if (Fcntl::O_NONBLOCK & file.fcntl(Fcntl::F_GETFL, 0)) != 0
    fdflags |= Wasi::FD_NONBLOCK
  end

  stat = file.stat #: File::Stat
  ftype = Wasi.to_ftype(stat.ftype)

  fs_right_base = 0
  fs_right_inheriting = 0

  case ftype
  when Wasi::FILETYPE_DIRECTORY
    fs_right_base = Wasi::RIGHT_DIR_RIGHT_BASE
    fs_right_inheriting = Wasi::RIGHT_FILE_RIGHT_BASE | Wasi::RIGHT_DIR_RIGHT_BASE
  when Wasi::FILETYPE_CHARACTER_DEVICE
    fs_right_base = Wasi::RIGHT_FILE_RIGHT_BASE & \
      (~Wasi::RIGHT_FD_SEEK) & (~Wasi::RIGHT_FD_TELL)
  else
    fs_right_base = Wasi::RIGHT_FILE_RIGHT_BASE
  end

  memory = store.memories[0]

  binformat = [fdflags, ftype, 0, 0, 0, 0, fs_right_base, fs_right_inheriting]
    .pack("SSC4QQ")
  memory.data[fdstat_offset...(fdstat_offset+binformat.size)] = binformat
  0
end

#fd_filestat_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 630

def fd_filestat_get(store, args)
  fd = args[0].value.to_i
  filestat_offset = args[1].value.to_i
  if fd >= fd_count
    return Wasi::EBADF
  end
  file = @fd_table[fd]
  if !file || file.is_a?(Wasi::PreopenedDir)
    return Wasi::EBADF
  end

  stat = file.stat #: File::Stat
  memory = store.memories[0]
  binformat = [stat.dev, stat.ino, Wasi.to_ftype(stat.ftype), stat.nlink, stat.size, stat.atime.to_i, stat.mtime.to_i, stat.ctime.to_i].pack("Q8")
  memory.data[filestat_offset...(filestat_offset+binformat.size)] = binformat
  0
end

#fd_prestat_dir_name(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 483

def fd_prestat_dir_name(store, args)
  fd = args[0].value.to_i
  path = args[1].value.to_i
  path_len = args[2].value.to_i
  if fd >= fd_count
    return Wasi::EBADF
  end
  file = @fd_table[fd]
  if !file.is_a?(Wasi::PreopenedDir)
    return Wasi::EBADF
  end
  name = file.path
  if name.size > path_len
    return Wasi::ENAMETOOLONG
  end
  name += ("\0" * (path_len - name.size))

  memory = store.memories[0]
  memory.data[path...(path+name.size)] = name
  0
end

#fd_prestat_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 462

def fd_prestat_get(store, args)
  fd = args[0].value.to_i
  prestat_offset = args[1].value.to_i
  if fd >= fd_count
    return Wasi::EBADF
  end
  file = @fd_table[fd]
  if !file.is_a?(Wasi::PreopenedDir)
    return Wasi::EBADF
  end
  name = file.path
  memory = store.memories[0]
  # Zero-value 8-bit tag, and 3-byte zero-value padding
  memory.data[prestat_offset...(prestat_offset+4)] = [0].pack("I!")
  memory.data[(prestat_offset+4)...(prestat_offset+8)] = [name.size].pack("I!")
  0
end

#fd_read(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 541

def fd_read(store, args)
  iargs = args.map do |elm|
    if elm.is_a?(I32)
      elm.value
    else
      raise Wardite::ArgumentError, "invalid type of args: #{args.inspect}"
    end
  end #: Array[Integer]
  fd, iovs, iovs_len, rp = *iargs
  if !fd || !iovs || !iovs_len || !rp
    raise Wardite::ArgumentError, "args too short"
  end
  file = self.fd_table[fd]
  return Wasi::EBADF if !file || file.is_a?(Wasi::PreopenedDir)
  memory = store.memories[0]
  nread = 0
  
  iovs_len.times do
    start = unpack_le_int(memory.data[iovs...(iovs+4)])
    iovs += 4
    slen = unpack_le_int(memory.data[iovs...(iovs+4)])
    iovs += 4
    buf = file.read(slen)
    if !buf
      break 0
    end
    memory.data[start...(start+buf.size)] = buf
    nread += buf.size
  end

  memory.data[rp...(rp+4)] = [nread].pack("I!")
  0
end

#fd_readdir(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 651

def fd_readdir(store, args)
  fd = args[0].value.to_i
  buf = args[1].value.to_i
  buf_len = args[2].value.to_i
  cookie = args[3].value.to_i
  result_buf_used = args[4].value.to_i

  if buf_len < 24 # when smaller than Dirent header size: Q! Q! I! I!
    return Wasi::EINVAL
  end

  memory = store.memories[0]
  
  if dirent_cache[fd]&.eof
    dirent_cache.delete(fd)
  end
  dir = @fd_table[fd]
  if dir.is_a?(Wasi::PreopenedDir) || (dir.is_a?(File) && dir.stat.ftype == "directory")
    dirent_cache[fd] ||= Wasi::DirentCache.new(dir.path)
  else
    return Wasi::EBADF
  end

  dirent = dirent_cache[fd]
  bindata, is_truncated = dirent.fetch_entries_binary(buf_len, cookie)

  bufused = bindata.size
  # bufused == buf_len means more dirents exist
  if is_truncated
    bufused = buf_len
    memory.data[buf...(buf+buf_len)] = bindata + "\0" * (buf_len - bindata.size)
  else
    dirent.eof = true
    memory.data[buf...(buf+bindata.size)] = bindata
  end

  memory.data[result_buf_used...(result_buf_used+4)] = [bufused].pack("I!")
  0
end

#fd_tell(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 693

def fd_tell(store, args)
  fd = args[0].value.to_i
  result_buf = args[1].value.to_i
  if fd >= fd_count
    return Wasi::EBADF
  end
  file = @fd_table[fd]
  if !file || file.is_a?(Wasi::PreopenedDir)
    return Wasi::EBADF
  end

  memory = store.memories[0]
  memory.data[result_buf...(result_buf+4)] = [file.tell].pack("I!")
  0
rescue Errno::EBADF
  return Wasi::EBADF
end

#fd_write(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 508

def fd_write(store, args)
  iargs = args.map do |elm|
    if elm.is_a?(I32)
      elm.value
    else
      raise Wardite::ArgumentError, "invalid type of args: #{args.inspect}"
    end
  end #: Array[Integer]
  fd, iovs, iovs_len, rp = *iargs
  if !fd || !iovs || !iovs_len || !rp
    raise Wardite::ArgumentError, "args too short"
  end
  file = self.fd_table[fd]
  return Wasi::EBADF if !file || file.is_a?(Wasi::PreopenedDir)
  memory = store.memories[0]
  nwritten = 0
  iovs_len.times do
    start = unpack_le_int(memory.data[iovs...(iovs+4)])
    iovs += 4
    slen = unpack_le_int(memory.data[iovs...(iovs+4)])
    iovs += 4
    # TODO: parallel write?
    nwritten += file.write(memory.data[start...(start+slen)])
  end

  memory.data[rp...(rp+4)] = [nwritten].pack("I!")

  0
end

#get_path_at(atfd, target) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 69

def get_path_at(atfd, target)
  target = resolv_path(target)

  at = @fd_table[atfd]
  pwd = case at
        when Wasi::PreopenedDir
          at.guest_path
        when File
          Dir.fchdir(at.fileno) do
            Dir.pwd
          end
        else
          raise ArgumentError, "invalid fd: #{atfd}"
        end

  ret = File.expand_path(target, pwd)
  ret
end

#interpret_open_flags(dirflags, oflags, fdflags, rights) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 92

def interpret_open_flags(dirflags, oflags, fdflags, rights)
  open_flags = 0
  if dirflags & Wasi::LOOKUP_SYMLINK_FOLLOW == 0
    open_flags |= File::Constants::NOFOLLOW
  end
  if oflags & Wasi::O_DIRECTORY != 0
    # open_flags |= File::Constants::DIRECTORY
    $stderr.puts "O_DIRECTORY is not supported, ignore" if ENV["WARDITE_TRACE"]
  elsif oflags & Wasi::O_EXCL != 0
    open_flags |= File::Constants::EXCL
  end

  default_mode = File::Constants::RDONLY
  if oflags & Wasi::O_TRUNC != 0
    open_flags |= File::Constants::TRUNC
    default_mode = File::Constants::RDWR
  end
  if oflags & Wasi::O_CREAT != 0
    open_flags |= File::Constants::CREAT
    default_mode = File::Constants::RDWR
  end
  if fdflags & Wasi::FD_NONBLOCK != 0
    open_flags |= File::Constants::NONBLOCK
  end
  if fdflags & Wasi::FD_APPEND != 0
    open_flags |= File::Constants::APPEND
    default_mode = File::Constants::RDWR
  end
  if fdflags & Wasi::FD_DSYNC != 0
    open_flags |= File::Constants::DSYNC
  end
  if fdflags & Wasi::FD_RSYNC != 0
    open_flags |= File::Constants::RSYNC
  end
  if fdflags & Wasi::FD_SYNC != 0
    open_flags |= File::Constants::SYNC
  end

  r = Wasi::RIGHT_FD_READ
  w = Wasi::RIGHT_FD_WRITE
  rw = r | w
  case
  when (rights & rw) == rw
    open_flags |= File::Constants::RDWR
  when (rights & w) == w
    open_flags |= File::Constants::WRONLY
  when (rights & r) == r
    open_flags |= File::Constants::RDONLY
  else
    open_flags |= default_mode
  end

  open_flags
end

#path_create_directory(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 263

def path_create_directory(store, args)
  fd = args[0].value.to_i
  path = args[1].value.to_i
  path_len = args[2].value.to_i
  path_str = store.memories[0].data[path...(path+path_len)]
  if !path_str
    return Wasi::ENOENT
  end

  target = get_path_at(fd, path_str)
  Dir.mkdir(target, 0700)
  0
  # TODO; rescue EBADF, ENOTDIR
end

#path_filestat_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 281

def path_filestat_get(store, args)
  fd = args[0].value.to_i
  flags = args[1].value.to_i
  path = args[2].value.to_i
  path_len = args[3].value.to_i
  target = get_path_at(fd, store.memories[0].data[path...(path+path_len)].to_s)

  stat = File.stat(target)
  memory = store.memories[0]
  binformat = [
    stat.dev, stat.ino, Wasi.to_ftype(stat.ftype), stat.nlink,
    stat.size, stat.atime.to_i, stat.mtime.to_i, stat.ctime.to_i
  ].pack("Q8")
  memory.data[flags...(flags+binformat.size)] = binformat
  0
rescue Errno::ENOENT
  return Wasi::ENOENT
end

#path_filestat_set_times(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 303

def path_filestat_set_times(store, args)
  fd = args[0].value.to_i
  # TODO: flags support
  _flags = args[1].value.to_i
  path = args[2].value.to_i
  path_len = args[3].value.to_i
  atim = args[4].value.to_i # nanoseconds
  mtim = args[5].value.to_i # nanoseconds
  target = get_path_at(fd, store.memories[0].data[path...(path+path_len)].to_s)

  atime = Time.at(atim.to_f / 1_000_000_000)
  mtime = Time.at(mtim.to_f / 1_000_000_000)
  File.utime(atime, mtime, target)
  0
end

#path_link(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 322

def path_link(store, args)
  old_fd = args[0].value.to_i
  old_path = args[1].value.to_i
  old_path_len = args[2].value.to_i
  old_name = get_path_at(old_fd, store.memories[0].data[old_path...(old_path+old_path_len)].to_s)

  new_fd = args[3].value.to_i
  new_path = args[4].value.to_i
  new_path_len = args[5].value.to_i
  new_name = get_path_at(new_fd, store.memories[0].data[new_path...(new_path+new_path_len)].to_s)

  File.link(old_name, new_name)
  0
end

#path_open(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 340

def path_open(store, args)
  dirfd = args[0].value.to_i
  dirflags = args[1].value.to_i
  path = args[2].value.to_i
  path_len = args[3].value.to_i
  oflags = args[4].value.to_i
  fs_rights_base = args[5].value.to_i
  _fs_rights_inheriting = args[6].value.to_i
  fs_flags = args[7].value.to_i
  fd_off = args[8].value.to_i

  path_name = get_path_at(dirfd, store.memories[0].data[path...(path+path_len)].to_s)
  open_flags = interpret_open_flags(dirflags, oflags, fs_flags, fs_rights_base)
  is_dir = (oflags & Wasi::O_DIRECTORY) != 0
  if is_dir && (oflags & Wasi::O_CREAT) != 0
    return Wasi::EINVAL
  end

  file = File.open(path_name, open_flags, 0600)
  fd = set_fd file

  memory = store.memories[0]
  memory.data[fd_off...(fd_off+4)] = [fd].pack("I!")
  0
rescue Errno::ENOENT
  return Wasi::ENOENT
end

#path_readlink(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 371

def path_readlink(store, args)
  fd = args[0].value.to_i
  path = args[1].value.to_i
  path_len = args[2].value.to_i
  buf = args[3].value.to_i
  buf_len = args[4].value.to_i
  result_buf = args[5].value.to_i

  if buf_len <= 0 || path_len <= 0
    return Wasi::EINVAL
  end
  target = get_path_at(fd, store.memories[0].data[path...(path+path_len)].to_s)

  link_target = File.readlink(target)
  if link_target.size > buf_len
    return Wasi::ENAMETOOLONG
  end

  memory = store.memories[0]
  memory.data[buf...(buf+link_target.size)] = link_target
  memory.data[result_buf...(result_buf+4)] = [link_target.size].pack("I!")
  0
end

#path_remove_directory(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 398

def path_remove_directory(store, args)
  fd = args[0].value.to_i
  path = args[1].value.to_i
  path_len = args[2].value.to_i
  path_str = store.memories[0].data[path...(path+path_len)].to_s
  target = get_path_at(fd, path_str)

  Dir.rmdir(target)
  0
end

#path_rename(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 412

def path_rename(store, args)
  fd = args[0].value.to_i
  old_path = args[1].value.to_i
  old_path_len = args[2].value.to_i

  new_fd = args[3].value.to_i
  new_path = args[4].value.to_i
  new_path_len = args[5].value.to_i

  old_target = get_path_at(fd, store.memories[0].data[old_path...(old_path+old_path_len)].to_s)
  new_target = get_path_at(new_fd, store.memories[0].data[new_path...(new_path+new_path_len)].to_s)

  File.rename(old_target, new_target)
  0
end

#path_symlink(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 431

def path_symlink(store, args)
  old_path = args[0].value.to_i
  old_path_len = args[1].value.to_i
  old_name = store.memories[0].data[old_path...(old_path+old_path_len)].to_s

  fd = args[2].value.to_i
  new_path = args[3].value.to_i
  new_path_len = args[4].value.to_i
  new_name = get_path_at(fd, store.memories[0].data[new_path...(new_path+new_path_len)].to_s)

  File.symlink(old_name, new_name)
  0
end

#path_unlink_file(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 448

def path_unlink_file(store, args)
  fd = args[0].value.to_i
  path = args[1].value.to_i
  path_len = args[2].value.to_i
  path_str = store.memories[0].data[path...(path+path_len)].to_s
  target = get_path_at(fd, path_str)

  File.unlink(target)
  0
end

#proc_exit(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 739

def proc_exit(store, args)
  exit_code = args[0].value
  exit(exit_code)
end

#random_get(store, args) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 747

def random_get(store, args)
  buf = args[0].value.to_i
  buflen = args[1].value.to_i
  randoms = SecureRandom.random_bytes(buflen) #: String
  memory = store.memories[0]
  memory.data[buf...(buf+buflen)] = randoms
  0
end

#resolv_path(orig_path) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 56

def resolv_path(orig_path)
  @mapdir.each do |k, v|
    if orig_path.start_with?(k)
      return v + orig_path[k.size..-1].to_s
    end
  end

  return orig_path
end

#set_fd(file) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 39

def set_fd(file)
  fd = @fd_count
  @fd_table[fd] = file
  @fd_count += 1
  fd
end

#set_preopened_dir(path, guest_path) ⇒ Object 



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# File 'lib/wardite/wasi.rb', line 49

def set_preopened_dir(path, guest_path)
  fd = @fd_count
  set_fd(::Wardite::Wasi::PreopenedDir.new(path, guest_path, fd))
end